# CVE-2021-23345: Server-side Request Forgery (SSRF)

> An attacker can exploit SSRF in the HTML conversion endpoint to read internal system files via crafted src attributes.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Feb 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-r97h-mg64-mcjr

## What is CVE-2021-23345?

CVE-2021-23345 is a medium-severity server-side request forgery vulnerability in github.com/thecodingmachine/gotenberg, published on 26 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

All versions of package github.com/thecodingmachine/gotenberg are vulnerable to Server-side Request Forgery (SSRF) via the /convert/html endpoint when the src attribute of an HTML element refers to an internal system file, such as <iframe src='file:///etc/passwd'>.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2021-23345?

It affects 1 product.


Products: Thecodingmachine Gotenberg.

## How do I fix CVE-2021-23345?

No fix has been published for CVE-2021-23345 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-23345 being exploited?

There is no known exploitation of CVE-2021-23345 in the wild and no public exploit code.

## Other vulnerabilities in github.com/thecodingmachine/gotenberg

- [CVE-2026-40281](https://insights.sbomify.com/CVE-2026-40281/): Gotenberg vulnerable to argument injection via newlines in ExifTool metadata values (critical 10.0)
- [CVE-2026-42589](https://insights.sbomify.com/CVE-2026-42589/): Gotenberg: Unauthenticated RCE via ExifTool Metadata Key Injection (critical 9.8)
- [CVE-2020-13450](https://insights.sbomify.com/CVE-2020-13450/): Path traversal in n/a (critical 9.8)
- [CVE-2020-13451](https://insights.sbomify.com/CVE-2020-13451/): Code injection in n/a (critical 9.8)
- [CVE-2020-13452](https://insights.sbomify.com/CVE-2020-13452/): Privilege escalation in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-23345 and fix it if it is affected.

What it is: CVE-2021-23345 is a medium-severity server-side request forgery vulnerability in github.com/thecodingmachine/gotenberg, published on 26 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-23345 in the wild and no public exploit code.

Affected product: github.com/thecodingmachine/gotenberg. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-23345/ (Markdown: https://insights.sbomify.com/CVE-2021-23345/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-23345
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-23345
- OSV: https://osv.dev/vulnerability/CVE-2021-23345

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-23345/
Summaries are generated and may contain mistakes; the official description above is the record.